Perhaps you should try some spelling variations:
thinh le » trinh ly
truc ban » thuc ban, truc dan, truc van
te sach » toc sach
sach ty » sach y, sach tu, sach thu
tuc ban » thuc ban, tu ban, tuc dan
hieu va » lieu va, hieu qua
hieu ve » hieu van
hang ca » hang va, nang cao, hang tai
ty hang » ly hang, ty xang, thi hang
ca hoi » cau hoi, cua hoi, xa hoi
le cua » ly cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty hang ca hoi. ((hieu ve) OR (hieu va)) cam ((tuc ban) or (truc ban)) thinh le cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang ca hoi. ((hieu ve) OR (hieu va)) cam ((tuc ban) OR (truc ban)) thinh le cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hang ca hoi. ((hieu ve) OR (hieu va)) cam ((tuc ban) or (truc ban)) thinh le cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ty hang ca hoi. ((hieu ve) OR (hieu va)) cam ((tuc ban) or (truc ban)) thinh le cua vat*.